CVE-2025-54104: 
vulnerability analysis and mitigation

A type confusion vulnerability (CVE-2025-54104) was discovered in the Windows Defender Firewall Service. This security flaw was disclosed on September 9, 2025, and affects multiple versions of Windows operating systems including Windows 10, Windows 11, and various Windows Server editions (NVD).

The vulnerability is classified as CWE-843 (Access of Resource Using Incompatible Type) and has received a CVSS v3.1 base score of 6.7 (Medium severity). The attack vector is Local (AV:L), with Low attack complexity (AC:L), requiring High privileges (PR:H), and No user interaction (UI:N). The scope is Unchanged (S:U), with High impact on Confidentiality, Integrity, and Availability (C:H/I:H/A:H) (NVD, AttackerKB).

If successfully exploited, this vulnerability allows an authorized attacker with high privileges to elevate their privileges locally on the affected system. The impact assessment indicates potential high severity effects on system confidentiality, integrity, and availability (NVD).

Microsoft has released security updates to address this vulnerability. Users and administrators of affected systems should apply the latest security updates through the standard Windows Update mechanism (Microsoft).